Roll lathe headstock



April 23, 1940. w. R, DUDA ROLL LATHE umns'rocxs Filed Nov. 17, 1938 s Sheets-She'et 1 INVENTOR.

BY W b Z RM' M A QKW- WIT NE SSEJ April 23, 1940. i w DUDA 2,198,003

' ROLL LATHE HEADSTOCKS.

Filed Nov. 17, 1938 s Sheets-Sheet 2 WITNEJ 6E6 11%/ ENT OR. 6 0% BY wh w ww 4 4 ATTORNEYS.

' Apnl 23, 1940. w. R. DUDA ROLL LATHE HEADSTOCKS Filed Nov. 17, 1938 INVENTOR. R Ma.

WITNESJLIS BY v 4 ATTORNEYS Patented Apr. 23, 1940 UNlTED STATES PATENT OFFICE I I e ROLL L a'i rfisflsans'rocx Wentzel R. Dada,- Mount Lebanon, Pa.

6 Claims.

My invention is concerned with latheheadstocks, and relates more particularly to improvements in the means used to rotate the work supported by the headstock. I

Headstocks used to support and rotate steel rolls while turning, grinding or polishing them customarily support such rolls upon a dead or non-rotating center pin lodged either in a dead spindle or in a central portion of the frame. This 10 dead spindle or central frame portion extends out from the main frame of the headstock toward the roll and, upon this protruding section, there is journaled a driven face-place wheel which is operatively connected to and rotates the roll.

The face-plate wheel itself is provided at its periphery with a deep flange extending backwardly toward-the main frame and upon the inner face of this flange there are placed internal gear teeth. Meshing with these teeth and driving $0 the face-plate wheel there is commonly a pinion located upon the overhung end of a shaft also protruding out from the main frame, this shaft in turn being driven through a set of reduction.

gears.

Prejudicial consequences attend the use of such headstocks. because, among other things, it has always been the practice to turn down a roll by rotating its face across the cutting edge of a fixed tool. Since this cutting action is violent and 30 occurs only at one point upon the roll face, jerky and vibratory reaction forces arise in the roll and are transmitted from it to the headstock. These forces cause the overhung shaft and driving a pinion to buck and chatter and, by this action,

5 to create new and greater forces which are transmitted back into the roll. Frequently these incidental forces are of such magnitude that the roll itself vibrates considerably and the turning 40 down results in an uneven and rippling roll face.

This result has naturally necessitated the doing of much additional finishing work and has in some cases ruined the roll. Moreover, such chattering and vibrating in the headstock has has- 5 tened the depreciation of its various moving parts.

Also various minor difliculties have been present in these headstocks. The protruding position of the face-plate wheel and driving pinion 50 has made necessary their lubrication by hand rather than by force feed or splash methods. And the face-plate wheel, with its internal gear teeth, has been put in place only by sliding its teeth along the teeth of the pinion, so that the 55 teeth of the two members have to be straight,

rather than ofsome more advantageous shape, such as double helical.

In view of the foregoing, the primary object of my invention is to provide a lathe headstock which is so constructed that it overcomes theobjectionable characteristics .of those heretofore used. v

Other objects will befully disclosed by the ensuing description.

In the headstock provided according to my invention, the dead center pin and its supporting element may be the same as heretofore, and the driven face-plate wheel is journaled near the. roll' end of this element. The main frame of the headstock, however, is itself extended toward the '15 roll to terminate in an end wall in a vertical plane passing in a general direction through the roll end of the dead element, and is snugly fitted about the periphery of the face-plate wheel. Thepinion shaft is positioned beyond the pe- 2o riphery of the face-plate wheel and its roll end provided with a bearing section which is journaled in the above-mentioned end wall of the main frame. The driving pinion on this shaft is located between this bearing section and the customary bearing sections, so that it is no longer overhung. Finally, the teeth of the driving pinion mesh with and drive external'gear teeth on the face-plate wheel.

The preferred embodiment of my invention is illustrated in the accompanying drawings, of which Fig. 1 is an elevation, partly in section, of the roll end of the headstock, the sectional portions being taken on the plane indicated by the line II on Figs. 2 and 3; Fig. 2 a sectional view along 'the horizontal plane 11-11 of Fig. l; and

Fig. 3 a sectional view along the oblique plane III-I1I of Fig. l.

In the headstock as disclosed in these drawings, the main frame is essentially composed of two principal parts, a main or bed frame I and a cover frame 2 which is bolted or otherwise attached to the bed frame along a horizontal meet- I ing plane 3. These frame members include an end wall 4 adjacent to the roll-engaging end of the headstock, and. a wall 5 at the other end. In the meeting surface 3 of roll end 4 of bed frame I there are two semi-circular channels 6a and la which areopposed by two similar complementary channels 6b and lb in the meeting surface 3 of cover frame 2, these pairs of complementary channels forming openings for two journal boxes 6 and I for the bearing sections of a two rotating shafts. Likewise. openings for two journal boxes 6' and 'I' are providedin rear end nels in meeting surface 3 of both cover frame 2 and bed frame I. Supported in journal boxes I and 6' isa shaft 8 which receives power from .a prime mover 8 and transmits it through a set of reduction gears, as will be' hereinafter described. Between Journal boxes 1 and 'I' is a pinion shaft I which receives power from shaft 6 and transmits it through a drivingpinion to the roll, as will be described. Cover plates II are bolted over theotherwise open ends of the Journal boxes.

Roll end 4 of bed frame I is also provided with a circular aperture l2 through which extends one end of a dead spindle l3 which is rigidly supported in its central and rear sections by other portions of bed frame I, as will be described.

A center pin 14 for supporting the work is wedged into a cavity in the roll end of spindle l3, and journaled upon said spindle is a driven faceplate wheel l5 which is integrally provided with a plurality of lugs I 6 which engage turnin means attached to the roll to rotate it.

Fig. 2 discloses more particularly the manner in which power is transmitted from motor 9 to pinion shaft III. A shaft I'I driven by the motor passes through an aperture It in one side of bed frame I and extendsbeneath shafts 6and-l0 to a journal box I! positioned in the opposite wall of bed frame I. Shaft I1 is provided with a worm thread (not shown) which meshes with and drives a worm wheel keyed or otherwise rigidly attached to shaft 8.. Also keyed or otherwise operatively connected to shaft 8 are two pinions 2| and 22, pinion 2| being shown as integral with said shaft. These pinions mesh with and continuously drive external .gear wheels 23 and 24, respectively, which are journaled upon and freely rotate about pinion shaft l0. Gear wheels 23 and 24 are each provided with a set of internal gear teeth 23a and 24b, respectively. each of which is capable of meshing with external gear teeth 25a or 25b, respectively, upon a sleeve 25 surrounding pinion shaft J0, which sleeve is operatively connected to shaft i ll, so that the two rotate together.

Also, upon shaft I0 I provide a driving pinion 26, which is shown integral with said shaft, though obviously operative connection between these two members might be effected in numerous ways.

Attention is now directed to Fig. 3. Rear wall 5 of bed frame I is providedinteriorly with a sleeve 21, preferably cast integrally with the wall section and braced at several points by internal walls 28. Into this sleeve, dead spindle I3 is wedged and tightly secured, as by means of a nut 29. Upon the portion of spindle l3 which extends beyond sleeve 21, face-plate wheel I5 is freely journaled, the roll end of said spindle and wheel extending, as before mentioned, through aperture l2 in bed frame I. An external gear ring is operatively connected with the periphery of faceplate wheel l5, preferably by a key 3|, as shown, though it may be cast integrally with said wheel, the gear ring 30 meshing with and being rotated by driving pinion 26. A roll 32 is shown inposition with one end supported upon dead center 2,198,003 wall 5, bythe formation of semi-circular chanpin l4. A collar 33 encircles and engages the Wobbler section of said roll and is provided'with a plurality of horizontal integral lugs 34 which extendtoward face-plate wheell5 and engage with lugs l6.

Thus, when motor 9 is operating and pinions 2| and 22 and gear wheels 23 and 24 are being rotated by shaft 8, sleeve 25 may be placed in operative connection with either of said gear wheels. When this is done, pinion shaft I0 is driven through said sleeve, and driving pinion 26, engaging gear ring 30, rotates face-plate wheel l5. Through the engagement of lugs I6 and 34, roll 32 is thus 'slowly turned about its axis. It will be noted that driving pinion 26 is located between the two bearing sections of pinion shaft l0. Any vibratory forces transmitted to said pinion from roll 32 are successfully resisted and dissipated when the driving pinion is in this position and whipping and chattering of the driving pinion and its shaft are minimized or eliminated. Consequently the creation of incidental forces is prevented, with the result that a smoother roll face results and deterioration of the headstock itself is slowed up.

Also with the headstock thus provided double helical-gear teeth may be utilized throughout.

making possible the engagement of double helical gear teeth. This substitution results in quiete 7. smoother running, and it will be noted that all the gearing is within the main frame of the headstock,-so that advantageous lubrication of the driving pinion 26 and gear ring 30 by force feed or splash methodsis both possible and economic.

' Clearly'numerous variations may be made in this headstock without departing from my invention.- Thus, for example, face-plate wheel I5 and gear ring 30 may be made in a single piece.

Likewise sleeve 21 may be extended further along dead spindle l3 until face-plate wheel I5 is journaled directly upon it rather than upon said spindle. :And I desire it to be understood that my invention is equally applicable to a headstock in which the spindle and center pin rotate instead of remaining dead.

According to the provisions of the patent statutes I have explained the principle and mode of operation of my invention and have illustrated and described what I now consider to represent its best embodiment. However, I desire to have it understood that, within the scope of the ap pended claims, the invention may be practiced otherwise than as specifically illustrated and described.

I claim:

l. A roll lathe headstock comprising a worksupporting stationary center pin, aface-plate wheel rotatable about the axis of said center pin, an external gear connected to said face-plate wheel and provided withv helical teeth, a driven shaft provided with an external driving pinion having helical teeth meshing with said gear teeth, and bearings rotatably supporting said shaft at both sides of said driving pinion.

2. A roll lathe headstock comprising a closed housinghaving an end wall provided'with a circular opening, a dead spindle within the housing and provided with a stationary centering pin pro- Jecting through the center of said opening, a face-plate wheel journaled upon said spindle and provided with means for rotating the work, said wheel being snugly received in said opening, an external gear connected to said face-plate wheel within the housing, a driven shaft in the housing provided with an external driving pinion meshing with said gear, and bearings rotatably supporting said shaft at both sides of said driving pinion.

3. A lathe headstock comprising a bed frame, a detachable cover frame joined to said bed frame, a face-plate and a driven pinion shaft provided with an external pinion for rotating the face-plate and having bearing sections upon either side of said pinion, said bearing sections being lodged in bearings which are received between said cover frame and said bed frame.

4. A lathe headstock comprising a bed frame, a removable cover frame joined to said bed frame, a rotatable face-plate wheel, an external gear connected to said face-plate wheel, a driven pinion shaft provided with an external'pinion meshing with said gear and bearings rotatably supporting said shaft upon both sides of said pinion,

g5 said bearings being received between said bed frame and said removable cover frame, whereby said pinion may be meshed with said gear by lowering said pinion down upon said bed frame when the cover frame is removed.

5. A lathe headstock comprising a bed frame, a removable cover frame joined to said bed frame along a horizontal meeting plane. a rotatable face-plate wheel, an external gear connected to said face-plate wheel, a driven pinion shaft provided with an external pinion meshing with said gear and bearings rotatably supporting said shaft upon both sides of said pinion, said bearings being received between said bed frame and said removable cover frame, whereby said pinion may be meshed with said gear by lowering said pinion down upon said bed frame when the cover frame is removed.

6. A roll lathe headstock comprising a worksupporting stationary center pin, a face-plate wheel rotatable about the axis of said center pin, an external gear connected toas aid face-plate wheel and provided with helical teeth, and a driven shaft provided with an external driving pinion having helical teeth meshing with said gear teeth.

WENIZEL R. DUDA. 

